81. The ability of ecologists to identify regions of greatest species richness could have an impact on the preservation of genetic diversity, a major objective of the World Conservation Strategy. The article Prediction of Rarities from Habitat Variables:

Coastal Plain Plants on Nova Scotian Lakeshores

(Ecology, 1992: 1852—1859) used a sample of n 

37 lakes to obtain the estimated regression equation where y  species richness, x1  watershed area, x2  shore width, x3  poor drainage (%), x4 

water color (total color units), x5  sand (%), and x6  alkalinity. The coef cient of multiple determination was reported as R2  .83. Carry out a test of model utility.